Has anyone done any studies on giving babies multiple vaccinations in one shot
as a probable cause of autism? I know that single vaccinations have been
studied, but I don't think multiple ones at a time has been studied. When
did the U.S. begin giving babies so many vaccinations in one shot?

@Sal, researchers have tried just about everything that they can think of to
investigate any possible link at all between any vaccines (including DTaP and
MMR) to autism. Not one peer-reviewed study has ever been able to show that any
vaccine or combination of vaccines has anything to do with autism. For the
second part of your question, the US began giving babies so many vaccines in one
shot when they realized that it was less expensive to only use one needle. The
pharmaceutical company had to spend about $1.2 billion and about a decade of
clinical trials to prove that the combination vaccine was fine before they could
sell it, so I see no problem with the one-shot vaccinations for children.